From 7515ce3fa8b30f7b7d67bc2a659e15276c0923d7 Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Tue, 30 Aug 2016 04:46:47 -0500
Subject: Initial commit

---
 dlvsym.c  | 14 ++++++++++++++
 malloc.c  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 math.c    | 21 +++++++++++++++++++++
 stdio.c   |  3 +++
 stdlib.c  |  8 ++++++++
 string.c  | 32 ++++++++++++++++++++++++++++++++
 version.c | 14 ++++++++++++++
 7 files changed, 138 insertions(+)
 create mode 100644 dlvsym.c
 create mode 100644 malloc.c
 create mode 100644 math.c
 create mode 100644 stdio.c
 create mode 100644 stdlib.c
 create mode 100644 string.c
 create mode 100644 version.c

diff --git a/dlvsym.c b/dlvsym.c
new file mode 100644
index 0000000..3d744ea
--- /dev/null
+++ b/dlvsym.c
@@ -0,0 +1,14 @@
+#include <dlfcn.h>	// dlsym
+#include <stdio.h>	// fprintf
+#include <stdlib.h>	// getenv
+
+void *dlvsym(void *handle, char *symbol, char *version)
+{
+	if(getenv("GLIBC_FAKE_DEBUG"))
+	{
+		fprintf(stderr, "symbol %s with version %s is being redirected",
+			symbol, version);
+	}
+
+	return dlsym(handle, symbol);
+}
diff --git a/malloc.c b/malloc.c
new file mode 100644
index 0000000..3a5818c
--- /dev/null
+++ b/malloc.c
@@ -0,0 +1,46 @@
+/* struct mallinfo pulled from mallinfo.3:
+ *
+ * Copyright (c) 2012 by Michael Kerrisk <mtk.manpages@gmail.com>
+ * 
+ * Permission is granted to make and distribute verbatim copies of this
+ * manual provided the copyright notice and this permission notice are
+ * preserved on all copies.
+ * 
+ * Permission is granted to copy and distribute modified versions of this
+ * manual under the conditions for verbatim copying, provided that the
+ * entire resulting derived work is distributed under the terms of a
+ * permission notice identical to this one.
+ * 
+ * Since the Linux kernel and libraries are constantly changing, this
+ * manual page may be incorrect or out-of-date.  The author(s) assume no
+ * responsibility for errors or omissions, or for damages resulting from
+ * the use of the information contained herein.  The author(s) may not
+ * have taken the same level of care in the production of this manual,
+ * which is licensed free of charge, as they might when working
+ * professionally.
+ * 
+ * Formatted or processed versions of this manual, if unaccompanied by
+ * the source, must acknowledge the copyright and authors of this work.
+ */
+
+#include <string.h>	/* memset */
+
+struct mallinfo {
+	int arena;     /* Non-mmapped space allocated (bytes) */
+	int ordblks;   /* Number of free chunks */
+	int smblks;    /* Number of free fastbin blocks */
+	int hblks;     /* Number of mmapped regions */
+	int hblkhd;    /* Space allocated in mmapped regions (bytes) */
+	int usmblks;   /* Maximum total allocated space (bytes) */
+	int fsmblks;   /* Space in freed fastbin blocks (bytes) */
+	int uordblks;  /* Total allocated space (bytes) */
+	int fordblks;  /* Total free space (bytes) */
+	int keepcost;  /* Top-most, releasable space (bytes) */
+};
+
+struct mallinfo mallinfo(void)
+{
+	struct mallinfo my_info;
+	memset(&my_info, 0, sizeof(struct mallinfo));
+	return my_info;
+}
diff --git a/math.c b/math.c
new file mode 100644
index 0000000..bacec36
--- /dev/null
+++ b/math.c
@@ -0,0 +1,21 @@
+#include <math.h>	// isinf, isnan
+
+int __isinff(float number)
+{
+	return isinf(number);
+}
+
+int __isinf(double number)
+{
+	return isinf(number);
+}
+
+int __isnanf(float number)
+{
+	return isnan(number);
+}
+
+int __isnan(double number)
+{
+	return isnan(number);
+}
diff --git a/stdio.c b/stdio.c
new file mode 100644
index 0000000..f26b69b
--- /dev/null
+++ b/stdio.c
@@ -0,0 +1,3 @@
+#include <stdio.h>
+
+asm(".equ __IO_2_1_stdout_, _stdout");
diff --git a/stdlib.c b/stdlib.c
new file mode 100644
index 0000000..b81eb91
--- /dev/null
+++ b/stdlib.c
@@ -0,0 +1,8 @@
+#include <assert.h>	// assert
+#include <stdlib.h>	// strtod
+
+double __strtod_internal(const char *__nptr, char **__endptr, int __group)
+{
+	assert(__group == 0);
+	return strtod(__nptr, __endptr);
+}
diff --git a/string.c b/string.c
new file mode 100644
index 0000000..5bbb1b3
--- /dev/null
+++ b/string.c
@@ -0,0 +1,32 @@
+#include <string.h>	/* strndup */
+
+/* Literally a useless __ alias. */
+char *__strndup(const char *str, size_t count)
+{
+	return strndup(str, count);
+}
+
+/* The existance of this method, and the fact it is used in real code, gives
+ * me nightmares. */
+void *rawmemchr(const void *s, int c)
+{
+	const unsigned char *haystack = s;
+	unsigned char needle = (unsigned char)c;
+	while(*haystack++ != needle);
+	return (void *)haystack;
+}
+
+extern __typeof(rawmemchr) __rawmemchr __attribute__((weak, alias("rawmemchr")));
+
+/* Another useless __ alias */
+char *__strtok_r(char *str, const char *delim, char **saveptr)
+{
+	return strtok_r(str, delim, saveptr);
+}
+
+/* The "global" definition of strsep in glibc, used when architecture dependent
+ * assembler versions aren't good enough. */
+char *__strsep_g(char **stringp, const char *delim)
+{
+	return strsep(stringp, delim);
+}
diff --git a/version.c b/version.c
new file mode 100644
index 0000000..63146f8
--- /dev/null
+++ b/version.c
@@ -0,0 +1,14 @@
+#include <stdlib.h>	// getenv
+
+const char *gnu_get_libc_version(void)
+{
+	char *ver = getenv("GLIBC_FAKE_VERSION");
+	if(ver == NULL) ver = "2.8";
+
+	return ver;
+}
+
+const char *gnu_get_libc_release(void)
+{
+	return "stable";
+}
-- 
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